package com.ulwx.tool.path;

import com.ulwx.tool.Assert;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URL;

class VfsResource extends AbstractResource {

   private final Object resource;


   /**
    * Create a new {@code VfsResource} wrapping the given resource handle.
    * @param resource a {@code org.jboss.vfs.VirtualFile} instance
    * (untyped in order to avoid a static dependency on the VFS API)
    */
   public VfsResource(Object resource) {
       Assert.notNull(resource, "VirtualFile must not be null");
       this.resource = resource;
   }


   @Override
   public InputStream getInputStream() throws IOException {
       return VfsUtils.getInputStream(this.resource);
   }

   @Override
   public boolean exists() {
       return VfsUtils.exists(this.resource);
   }

   @Override
   public boolean isReadable() {
       return VfsUtils.isReadable(this.resource);
   }

   @Override
   public URL getURL() throws IOException {
       try {
           return VfsUtils.getURL(this.resource);
       }
       catch (Exception ex) {
           throw new RuntimeException("Failed to obtain URL for file " + this.resource, ex);
       }
   }

   @Override
   public URI getURI() throws IOException {
       try {
           return VfsUtils.getURI(this.resource);
       }
       catch (Exception ex) {
           throw new RuntimeException("Failed to obtain URI for " + this.resource, ex);
       }
   }

   @Override
   public File getFile() throws IOException {
       return VfsUtils.getFile(this.resource);
   }

   @Override
   public long contentLength() throws IOException {
       return VfsUtils.getSize(this.resource);
   }

   @Override
   public long lastModified() throws IOException {
       return VfsUtils.getLastModified(this.resource);
   }

   @Override
   public Resource createRelative(String relativePath) throws IOException {
       if (!relativePath.startsWith(".") && relativePath.contains("/")) {
           try {
               return new VfsResource(VfsUtils.getChild(this.resource, relativePath));
           }
           catch (IOException ex) {
               // fall back to getRelative
           }
       }

       return new VfsResource(VfsUtils.getRelative(new URL(getURL(), relativePath)));
   }

   @Override
   public String getFilename() {
       return VfsUtils.getName(this.resource);
   }

   @Override
   public String getDescription() {
       return "VFS resource [" + this.resource + "]";
   }

   @Override
   public boolean equals(Object other) {
       return (this == other || (other instanceof VfsResource &&
               this.resource.equals(((VfsResource) other).resource)));
   }

   @Override
   public int hashCode() {
       return this.resource.hashCode();
   }

}
